I don't like to be a killjoy and I may be just an alarmist here, but just to be on the safe side you might want to have the tooth checked out. I was told that if you have a really bad toothache and it stops it is because the nerve is now dead from the decay. Of course even if that is the case it may be that the oil pulling will keep the tooth from rotting by whatever it is the is working in so many cases.
I have a toothache and the oil pulling, although it is having some good effects has not helped with that. I am awaiting the delivery though, of some oregano oil from mh to see if that may be of some help here.